TERMINAL, RADIO COMMUNICATION METHOD, AND BASE STATION
A terminal according to one aspect of the present disclosure includes a receiving section that receives a TCI list indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, that receives an update list indicating a plurality of serving cells, and that receives indication information to indicate one or more TCI states out of the plurality of TCI states in one of the plurality of serving cells, and a control section that applies the one or more TCI states to the multiple types of channels in the plurality of serving cells. According to one aspect of the present disclosure, it is possible to appropriately determine information related to QCL.
Latest NTT DOCOMO, INC. Patents:
The present disclosure relates to a terminal, a radio communication method, and a base station in next-generation mobile communication systems.
BACKGROUND ARTIn a Universal Mobile Telecommunications System (UMTS) network, the specifications of Long-Term Evolution (LTE) have been drafted for the purpose of further increasing high speed data rates, providing lower latency and so on (see Non-Patent Literature 1). In addition, for the purpose of further high capacity, advancement and the like of the LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8 and Rel. 9), the specifications of LTE-Advanced (3GPP Rel. 10 to Rel. 14) have been drafted.
Successor systems of LTE (for example, also referred to as “5th generation mobile communication system (5G),” “5G+ (plus),” “6th generation mobile communication system (6G),” “New Radio (NR),” “3GPP Rel. 15 (or later versions),” and so on) are also under study.
CITATION LIST Non-Patent LiteratureNon-Patent Literature 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8),” April, 2010
SUMMARY OF INVENTION Technical ProblemFor future radio communication systems (for example, NR), a user terminal (terminal, User Equipment (UE)) that controls transmission/reception processing on the basis of information related to quasi-co-location (QCL) (QCL assumption/Transmission Configuration Indication (TCI) state/spatial relation) is under study.
However, there is a case where the information related to the QCL is indefinite. Unless the information related to the QCL is definite, communication quality reduction, throughput reduction, and the like may occur.
Thus, an object of the present disclosure is to provide a terminal, a radio communication method, and a base station that appropriately determine information related to QCL.
Solution to ProblemA terminal according to one aspect of the present disclosure includes a receiving section that receives a TCI list indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, that receives an update list indicating a plurality of serving cells, and that receives indication information to indicate one or more TCI states out of the plurality of TCI states in one of the plurality of serving cells, and a control section that applies the one or more TCI states to the multiple types of channels in the plurality of serving cells.
Advantageous Effects of InventionAccording to one aspect of the present disclosure, it is possible to appropriately determine information related to QCL.
For NR, control of reception processing (for example, at least one of reception, demapping, demodulation, and decoding) and transmission processing (for example, at least one of transmission, mapping, precoding, modulation, and coding) in a UE regarding at least one of a signal and a channel (which is expressed as a signal/channel) based on a transmission configuration indication state (TCI state) is under study.
The TCI state may be a state applied to a downlink signal/channel. A state that corresponds to the TCI state applied to an uplink signal/channel may be expressed as spatial relation.
The TCI state is information related to quasi-co-location (QCL) of the signal/channel, and may be referred to as a spatial reception parameter, spatial relation information, or the like. The TCI state may be configured for the UE for each channel or for each signal.
QCL is an indicator indicating statistical properties of the signal/channel. For example, when a certain signal/channel and another signal/channel are in a relationship of QCL, it may be indicated that it is assumable that at least one of Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (for example, a spatial reception parameter (spatial Rx parameter)) is the same (the relationship of QCL is satisfied in at least one of these) between such a plurality of different signals/channels.
Note that the spatial reception parameter may correspond to a receive beam of the UE (for example, a receive analog beam), and the beam may be identified based on spatial QCL. The QCL (or at least one element in the relationship of QCL) in the present disclosure may be interpreted as sQCL (spatial QCL).
For the QCL, a plurality of types (QCL types) may be defined. For example, four QCL types A to D may be provided, which have different parameter(s) (or parameter set(s)) that can be assumed to be the same, and such parameter(s) (which may be referred to as QCL parameter(s)) are described below:
-
- QCL type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread
- QCL type B (QCL-B): Doppler shift and Doppler spread
- QCL type C (QCL-C): Doppler shift and average delay
- QCL type D (QCL-D): Spatial reception parameter
A case that the UE assumes that a certain control resource set (CORESET), channel, or reference signal is in a relationship of specific QCL (for example, QCL type D) with another CORESET, channel, or reference signal may be referred to as QCL assumption.
The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) of the signal/channel, based on the TCI state or the QCL assumption of the signal/channel.
The TCI state may be, for example, information related to QCL between a channel as a target (in other words, a reference signal (RS) for the channel) and another signal (for example, another RS). The TCI state may be configured (indicated) by higher layer signaling or physical layer signaling, or a combination of these.
The physical layer signaling may be, for example, downlink control information (DCI).
A channel for which the TCI state or spatial relation is configured (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
The RS to have a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a reference signal for measurement (Sounding Reference Signal (SRS)), a CSI-RS for tracking (also referred to as a Tracking Reference Signal (TRS)), and a reference signal for QCL detection (also referred to as a QRS).
The SSB is a signal block including at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may be referred to as an SS/PBCH block.
An RS of QCL type X in a TCI state may mean an RS to have a relationship of QCL type X with (a DMRS for) a certain channel/signal, and this RS may be referred to as a QCL source of QCL type X in the TCI state.
(Pathloss RS)Pathloss PLb,f,c (qd) [dB] in transmit power control for each of the PUSCH, PUCCH, and SRS is calculated by the UE with index qd of a reference signal (RS, pathloss reference RS (PathlossReferenceRS)) for a downlink BWP associated with active UL BWP b for carrier f in serving cell c. In the present disclosure, the pathloss reference RS, a pathloss (PL)-RS, index qd, an RS used for pathloss calculation, and an RS resource used for pathloss calculation may be interchangeably interpreted. In the present disclosure, calculate, estimate, measure, and track may be interchangeably interpreted.
Whether an existing system for higher layer filtered RSRP for pathloss measurement is changed when the pathloss RS is updated by a MAC CE is under study.
When the pathloss RS is updated by the MAC CE, pathloss measurement based on L1-RSRP may be applied. At an available timing after the MAC CE for updating the pathloss RS, higher layer filtered RSRP may be used for pathloss measurement, and L1-RSRP may be used for pathloss measurement before the higher layer filtered RSRP is applied. At an available timing after the MAC CE for updating the pathloss RS, higher layer filtered RSRP may be used for pathloss measurement, and higher layer filtered RSRP for a previous pathloss RS may be used before that timing. The higher layer filtered RSRP may be used for pathloss measurement in a manner similar to that of operation in Rel. 15, and the UE may track all pathloss RS candidates configured by RRC. A maximum number of pathloss RSs configurable by the RRC may depend on a UE capability. When the maximum number of pathloss RSs configurable by the RRC is X, pathloss RS candidates being X or less may be configured by the RRC, and a path loss RS may be selected by the MAC CE from the configured pathloss RS candidates. The maximum number of pathloss RSs configurable by the RRC may be 4, 8, 16, 64, or the like.
In the present disclosure, the higher layer filtered RSRP, filtered RSRP, and layer 3 filtered RSRP may be interchangeably interpreted.
(Default TCI State/Default Spatial Relation/Default PL-RS)In an RRC connected mode, in both a case where information of TCI in DCI (higher layer parameter TCI-PresentlnDCI) is set to “enabled” and a case where the information of TCI in DCI is not configured, when time offset between reception of DL DCI (DCI to schedule a PDSCH) and a corresponding PDSCH (PDSCH scheduled by the DCI) is less than a threshold value (timeDurationForQCL) (application condition, first condition), and in a case of non-cross carrier scheduling, a TCI state (default TCI state) for the PDSCH may be a TCI state with the lowest CORESET ID in the latest slot in an active DL BWP for that CC (for a specific UL signal). In cases other than the case, the TCI state (default TCI state) for the PDSCH may be a TCI state with the lowest TCI state ID of a PDSCH in an active DL BWP for a scheduled CC.
In Rel. 15, individual MAC CEs for a MAC CE for PUCCH spatial relation activation/deactivation and a MAC CE for SRS spatial relation activation/deactivation are necessary. A PUSCH spatial relation follows the SRS spatial relation.
In Rel. 16, at least one of the MAC CE for PUCCH spatial relation activation/deactivation and the MAC CE for SRS spatial relation activation/deactivation may not be used.
If both a spatial relation and a PL-RS for a PUCCH are not configured in FR2 (application condition, second condition), default assumption for the spatial relation and PL-RS (default spatial relation and default PL-RS) is applied to the PUCCH. If both a spatial relation and a PL-RS for an SRS (SRS resource for the SRS or SRS resource corresponding to SRI in DCI format 0_1 to schedule a PUSCH) are not configured in FR2 (application condition, second condition), default assumption for the spatial relation and PL-RS (default spatial relation and default PL-RS) is applied to the PUSCH scheduled by DCI format 0_1, and the SRS.
If a CORESET is configured in an active DL BWP on that CC (application condition), the default spatial relation and default PL-RS may be a TCI state or QCL assumption for a CORESET having the lowest CORESET ID in the active DL BWP. If a CORESET is not configured in the active DL BWP on that CC, the default spatial relation and default PL-RS may be an active TCI state having the lowest ID for a PDSCH in the active DL BWP.
In Rel. 15, a spatial relation for a PUSCH scheduled by DCI format 0_0 follows a spatial relation for a PUCCH resource having the lowest PUCCH resource ID, out of active spatial relations for PUCCHs on the same CC. A network needs to update PUCCH spatial relations on all SCells even when the PUCCH is not transmitted on the SCell.
In Rel. 16, PUCCH configuration for the PUSCH scheduled by DCI format 0_0 is unnecessary. When an active PUCCH spatial relation or a PUCCH resource for the PUSCH scheduled by DCI format 0_0 is absent on an active UL BWP in that CC (application condition, second condition), the default spatial relation and default PL-RS are applied to the PUSCH.
A condition for application of the default spatial relation/default PL-RS for the SRS may include a case that an information element for enabling a default beam pathloss for the SRS (higher layer parameter enableDefaultBeamPlForSRS) is set to “enabled.” A condition for application of the default spatial relation/default PL-RS for the PUCCH may include a case that an information element for enabling a default beam pathloss for the PUCCH (higher layer parameter enableDefaultBeamPlForPUCCH) is set to “enabled.” A condition for application of the default spatial relation/default PL-RS for the PUSCH scheduled by DCI format 0_0 may include a case that an information element for enabling a default beam pathloss for the PUSCH scheduled by DCI format 0_0 (higher layer parameter enableDefaultBeamPlForPUSCH0_0) is set to “enabled.”
The above-described threshold value may be referred to as a time length (time duration) for QCL, “timeDurationForQCL,” “Threshold,” “Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI,” “Threshold-Sched-Offset,” a schedule offset threshold value, a scheduling offset threshold value, or the like.
(Unified/Common TCI Framework)According to a unified TCI framework, UL and DL channels can be controlled by a common framework. Instead of defining a TCI state or a spatial relation for each channel in a manner similar to that of Rel. 15, the unified TCI framework may indicate a common beam and apply the common beam to all UL and DL channels, or may apply a UL common beam to all UL channels and apply a DL common beam to all DL channels.
One common beam for both DL and UL or a DL common beam and a UL common beam (two common beams in total) are under study.
The UE may assume the same TCI state (joint TCI state, joint TCI state pool, joint common TCI state pool) for the UL and DL.
In an example of
Default beams for the UL and DL may be unified by MAC CE-based beam management (MAC CE-level beam indication). The default beams may be unified with a default UL beam (spatial relation) by updating a default TCI state for the PDSCH.
A common beam/unified TCI state from the same TCI state pool for both of the UL and DL (joint common TCI state pool) may be indicated by DCI-based beam management (DCI-level beam indication). M (>1) TCI states may be activated by the MAC CE. UL/DL DCI may select one TCI state from M active TCI states. The selected TCI state may be applied to channels/RSs for both of the UL and DL.
The UE may assume different TCI states (separate TCI states, separate TCI state pools, UL separate TCI state pool and DL separate TCI state pool, separate common TCI state pools, UL common TCI state pool and DL common TCI state pool) for the respective UL and DL.
In an example of
A MAC CE may select (activate) one or more (for example, multiple) TCI states (sets) for the respective UL and DL channels. The MAC CE may activate two sets of TCI states.
DL DCI may select (indicate) one or more (for example, one) TCI states. This TCI state may be applied to one or more DL channels. The DL channels may be PDCCHs/PDSCHs/CSI-RSs. The UE may determine a TCI state for each DL channel/RS by using TCI state operation (TCI framework) in Rel. 16.
UL DCI may select (indicate) one or more (for example, one) TCI states. This TCI state may be applied to one or more UL channels. The UL channels may be PUSCHs/SRSs/PUCCHs.
As use cases for separate common TCI state pools, use case 0, use case 1, and use case 2 below are under study.
[Use Case 0]The UE uses different UL beams originating from maximum permitted exposure (MPE).
In an example of
The UE uses different UL beams originating from UL signal strength.
In an example of
The UE uses different UL beams originating from UL load balance.
In an example of
It is conceivable that more scenarios having different requirements are to be studied. For example, in multi-TRP transmission, high-speed train (HST) transmission, inter-cell mobility in a period in which there is a possibility that the UE connects to two cells, and the like, a common beam for respective TRPs or cells may vary.
In this case, the UE may include multiple panels for FR2. In this case, a common beam for respective UE panels may vary.
In the unified TCI framework, the UE may support a joint TCI based on a DL TCI framework in Rel. 15/16. The TCI may include a TCI state including at least one source RS to provide reference (UE assumption) for determination of at least one of QCL and a spatial filter.
The UE that uses a joint TCI (joint TCI pool) including reference for both a DL beam and a UL beam and the UE that uses one separate TCI (pool) for DL and one separate TCI (pool) for UL are under study.
For the separate TCI pools, a case that a UL TCI state is obtained from the same pool as that for a DL TCI state and a case that a UL TCI state is obtained from a pool different from that for a DL TCI state are under study.
In the separate TCI pools, active TCI pools for the respective UL and DL may be configured/activated by RRC/MAC CE. An active TCI pool common to the UL and DL may be configured/activated by the RRC/MAC CE.
For DCI indication for a common beam (common TCI state), a TCI field in DL DCI may be reused, or a new field (for example, a unified TCI field) in the DL DCI may be used. The DL DCI, PDSCH scheduling DCI, and DCI format 1_1 or 1_2 may be interchangeably interpreted.
For DCI indication for a common beam (common TCI state), a new field (for example, a unified TCI field) in UL DCI may be used. The UL DCI, PUSCH scheduling DCI, and DCI format 0_1 or 0_2 may be interchangeably interpreted.
Feedback on DCI indication for a common beam (common TCI state) is under study. If reception of the DCI indication for the common beam has failed, a base station misrecognizes the common beam. Thus, a case that timing of update of the common beam is timing after the UE transmits feedback on the DCI indication is under study. For example, as shown in
In Rel. 16, one MAC CE can update beam indices (TCI states) of a plurality of CCs.
Up to two applicable CC lists (for example, applicable-CC-list) can be configured for the UE by RRC. When two applicable CC lists are configured, the two applicable CC lists may correspond to respective intra-band CA in FR1 and intra-band CA in FR2.
A TCI state activation MAC CE for a PDCCH activates a TCI state associated with the same CORESET ID on all BWPs/CCs in the applicable CC list.
A TCI state activation MAC CE for a PDSCH activates a TCI state on all BWPs/CCs in the applicable CC list.
A spatial relation activation MAC CE for an A-SRS/SP-SRS activates a spatial relation associated with the same SRS resource ID on all BWPs/CCs in the applicable CC list.
In an example of
A case that such simultaneous beam update is only applicable to a single TRP case is under study.
For the PDSCH, the UE may be based on procedure A below.
[Procedure A]In one CC/DL BWP or in one set of CCs/BWPs, the UE receives an activation command for mapping up to 8 TCI states to code points of a DCI field (TCI field). When one set of TCI state IDs is activated for one set of CCs/DL BWPs, then an applicable CC list is determined by a CC indicated in the activation command, and the same set of TCI states is applied to all DL BWPs in the indicated CC. Only if a plurality of different values of CORESET pool indices (CORESETPoolIndex) in a CORESET information element (ControlResourceSet) are not provided for the UE, and at least one TCI code point mapped to two TCI states is not provided for the UE, one set of TCI state IDs can be activated for one set of CCs/DL BWPs.
For the PDCCH, the UE may be based on procedure B below.
[Procedure B]If up to two lists of cells for simultaneous TCI state activation by a simultaneous TCI update list (at least one of simultaneousTCI-UpdateList-r16 and simultaneousTCI-UpdateListSecond-r16) are provided for the UE by a simultaneous TCI cell list (simultaneousTCI-CellList), the UE applies, to CORESETs having index p in all configured DL BWPs of all configured cells in one list determined on the basis of a serving cell index provided by a MAC CE command, antenna port quasi co-location (QCL) provided by TCI states having the same activated TCI state ID value. Only if a plurality of different values of CORESET pool indices (CORESETPoolIndex) in a CORESET information element (ControlResourceSet) are not provided for the UE, and at least one TCI code point mapped to two TCI states is not provided for the UE, the simultaneous TCI cell list can be provided for the simultaneous TCI state activation.
For a semi-persistent (SP)/aperiodic (AP)-SRS, the UE may be based on procedure C below.
[Procedure C]When spatial relation information (spatialRelationInfo) for SP or AP-SRS resources configured by an SRS resource information element (higher layer parameter SRS-Resource) is activated/updated for one set of CCs/BWPs by a MAC CE, then an applicable CC list is indicated by a simultaneous spatial update list (higher layer parameter simultaneousSpatial-UpdateList-r16 or simultaneousSpatial-UpdateListSecond-r16), and in all BWPs in an indicated CC, the spatial relation information is applied to the SP or AP-SRS resources having the same SRS resource ID. Only if a plurality of different values of CORESET pool indices (CORESETPoolIndex) in a CORESET information element (ControlResourceSet) are not provided for the UE, and at least one TCI code point mapped to two TCI states is not provided for the UE, spatial relation information (spatialRelationInfo) for SP or AP-SRS resources configured by an SRS resource information element (higher layer parameter SRS-Resource) is activated/updated for one set of CCs/BWPs by a MAC CE.
The simultaneous TCI cell list (simultaneousTCI-CellList) and simultaneous TCI update list (at least one of simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16) are lists of serving cells in which TCI relations can be simultaneously updated by using the MAC CE. simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16 do not include the same serving cell.
The simultaneous spatial updated list (at least one of higher layer parameters simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16) is a list of serving cells in which spatial relations can be simultaneously updated by using the MAC CE. simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16 do not include the same serving cell.
Here, the simultaneous TCI update list and the simultaneous spatial updated list are configured by the RRC, the CORESET pool indices of the CORESET are configured by the RRC, and the TCI code point mapped to the TCI states is indicated by the MAC CE.
(Constraints on QCL Configuration)As mentioned above, a case that a beam for multiple types of channels is controlled by common beam indication/activation (MAC CE/DCI) in accordance with a common TCI framework is under study, but this control is performed for one CC (cell).
Simultaneous beam update across a plurality of CCs specified in specifications for Rel. 16 can update a beam for a plurality of BWPs/CCs by using one MAC CE beam indication, and thus overhead of beam control can be reduced.
It is preferable that the simultaneous beam update across the plurality of CCs is also possible in the common TCI framework. However, there are constraints on configuration of QCL between a PDCCH and a tracking reference signal (TRS) in the plurality of CCs as follows.
For example, such configuration as shown in
For example, such configuration as shown in
When a TRS is configured as a QCL type A/D RS in a TCI state on a certain CC, a TRS of another CC fails to be configured as the QCL type A/D RS. Thus, also in a case where a common TCI pool or a common TCI is configured/updated/indicated between the plurality of CCs, TCI state (TCI state including the QCL type A/D RS) configuration will be performed for each CC.
When a CSI-RS is configured as a QCL type D RS in a TCI state on a certain CC, there is a case where a CSI-RS of another CC is configurable as the QCL type D RS in a TCI state for a PDCCH/PDSCH on the certain CC. Also in this case, it is necessary that CSI-RSs/TRSs of the same CC are configured as a QCL type A RS in the TCI state. The QCL type A RS indicates that parameters for determining channel identification, such as delay spreads and average delays, are the same, and thus this is caused by a possibility that values of these parameters are different from each other in different CCs.
Unless simultaneous common beam (common TCI) update across the plurality of CCs is performed appropriately, communication quality degradation, throughput degradation, and the like may occur.
Thus, the inventors of the present invention came up with the idea of a method for updating a TCI state.
Embodiments according to the present disclosure will be described in detail with reference to the drawings as follows. The radio communication methods according to respective embodiments may each be employed individually, or may be employed in combination.
In the present disclosure, “A/B/C” and “at least one of A, B, and C” may be interchangeably interpreted. In the present disclosure, a cell, a serving cell, a CC, a carrier, a BWP, a DL BWP, a UL BWP, an active DL BWP, an active UL BWP, and a band may be interchangeably interpreted. In the present disclosure, an index, an ID, an indicator, and a resource ID may be interchangeably interpreted. In the present disclosure, to support, to control, to be able to control, to operate, and to be able to operate may be interchangeably interpreted.
In the present disclosure, configure, activate, update, indicate, enable, specify, and select may be interchangeably interpreted.
In the present disclosure, a MAC CE and an activation/deactivation command may be interchangeably interpreted.
In the present disclosure, the higher layer signaling may be, for example, any one or combinations of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like. In the present disclosure, RRC, RRC signaling, an RRC parameter, a higher layer, a higher layer parameter, an RRC information element (IE), and an RRC message may be interchangeably interpreted.
The MAC signaling may use, for example, a MAC control element (MAC CE), a MAC Protocol Data Unit (PDU), or the like. The broadcast information may be, for example, a master information block (MIB), a system information block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), other system information (OSI), or the like.
In the present disclosure, a beam, a spatial domain filter, a spatial setting, a TCI state, a UL TCI state, a unified TCI state, a unified beam, a common TCI state, a common beam, TCI assumption, QCL assumption, a QCL parameter, a spatial domain reception filter, a UE spatial domain reception filter, a UE receive beam, a DL beam, a DL receive beam, DL precoding, a DL precoder, a DL-RS, an RS of QCL type D in a TCI state/QCL assumption, an RS of QCL type A in a TCI state/QCL assumption, a spatial relation, a spatial domain transmission filter, a UE spatial domain transmission filter, a UE transmit beam, a UL beam, a UL transmit beam, UL precoding, a UL precoder, and a PL-RS may be interchangeably interpreted. In the present disclosure, a QCL type X-RS, a DL-RS associated with QCL type X, a DL-RS having QCL type X, a source of a DL-RS, an SSB, a CSI-RS, and an SRS may be interchangeably interpreted.
UL DCI, DCI to schedule a UL channel (for example, a PUSCH), and DCI format 0_x (x=0, 1, 2, . . . ) may be interchangeably interpreted. DL DCI, DCI to schedule a DL channel (PDSCH), and DCI format 1_x (x=0, 1, 2, . . . ) may be interchangeably interpreted.
In the present disclosure, HARQ-ACK information, ACK, and NACK may be interchangeably interpreted.
In the present disclosure, a link direction, downlink (DL), uplink (UL), and one of UL and DL may be interchangeably interpreted.
In the present disclosure, a pool, a set, a group, and a list may be interchangeably interpreted.
In the present disclosure, a common beam, a common TCI, a common TCI state, a unified TCI, a unified TCI state, a TCI state applicable to DL and UL, a TCI state applied to a plurality (multiple types) of channels/RSs, a TCI state applicable to multiple types of channels/RSs, and a PL-RS may be interchangeably interpreted.
In the present disclosure, a plurality of TCI states configured by RRC, a plurality of TCI states activated by a MAC CE, a pool, a TCI state pool, an active TCI state pool, a common TCI state pool, a joint TCI state pool, a separate TCI state pool, a UL common TCI state pool, a DL common TCI state pool, a common TCI state pool configured/activated by RRC/MAC CE, and TCI state information may be interchangeably interpreted.
In the present disclosure, a CC list, a serving cell list, a CC list in cell group configuration (CellGroupConfig), an applicable list, a simultaneous TCI update list/second simultaneous TCI update list, simultaneousTCI-UpdateList1-r16/simultaneousTCI-UpdateList2-r16, a simultaneous TCI cell list, simultaneousTCI-CellList, a simultaneous spatial updated list/second simultaneous spatial updated list, simultaneousSpatial-UpdatedList1-r16/simultaneousSpatial-UpdatedList2-r16, a configured CC, a configured list, a BWP/CC in a configured list, all BWPs/CCs in a configured list, a CC indicated by an activation command, an indicated CC, a CC on which a MAC CE has been received, and information indicating a plurality of cells for update of at least one of a TCI state and a spatial relation may be interchangeably interpreted.
In the present disclosure, a MAC CE and an activation command may be interchangeably interpreted.
(Radio Communication Method)In the present disclosure, a DL TCI, a DL common TCI, a DL unified TCI, a common TCI, and a unified TCI may be interchangeably interpreted. In the present disclosure, a UL TCI, a UL common TCI, a UL unified TCI, a common TCI, and a unified TCI may be interchangeably interpreted.
In the present disclosure, a case of a joint TCI pool and a case where a joint TCI pool has been configured may be interchangeably interpreted. In the present disclosure, a case of a separate TCI pool and a case where a separate TCI pool has been configured may be interchangeably interpreted.
In the present disclosure, the case where the joint TCI pool has been configured, a case where a TCI pool configured for DL and a TCI pool configured for UL are in common, a case where a TCI pool for both DL and UL has been configured, and a case where one TCI pool (one set of TCIs) has been configured may be interchangeably interpreted.
In the present disclosure, the case where the separate TCI pool has been configured, a case where a TCI pool configured for DL and a TCI pool configured for UL are different from each other, a case where a DL TCI pool (a first TCI pool, a first TCI set) and a UL TCI pool (a second TCI pool, a second TCI set) have been configured, a case where a plurality of TCI pools (a plurality of sets of TCIs) have been configured, and a case where a DL TCI pool has been configured may be interchangeably interpreted. When a DL TCI pool has been configured, a UL TCI pool may be equal to the configured TCI pool.
In the present disclosure, a channel/RS to which the common TCI is applied may be a PDSCH/HARQ-ACK information/PUCCH/PUSCH/CSI-RS/SRS.
First EmbodimentA common TCI pool for each BWP/CC may be configured by a higher layer.
A combination (pair, list) of a plurality of BWPs/a plurality of CCs may be notified/configured by the higher layer. A parameter (CC list) for notifying the combination of the plurality of BWPs/the plurality of CCs may be a simultaneous spatial updated list in Rel. 16 (simultaneousSpatial-UpdatedList-r16/simultaneousSpatial-UpdatedListSecond-r16), or may be a new parameter.
The CC list may be a list of CCs. Common TCI indication may be applied to all CCs/BWPs included in the CC list. The CC list may be configured by RRC, and which one or more CCs out of a plurality of CCs included in the CC list the common TCI indication is applied to may be indicated/selected by a MAC CE. In other words, the CC list may be notified by the RRC and the MAC CE.
When a joint common TCI pool for UL and DL is configured, and a common TCI is updated in at least one BWP/CC out of BWPs/CCs included in the CC list, the UE may apply the updated common TCI to all BWPs/CCs included in the CC list.
When a separate common TCI pool for the UL/DL is configured, a common TCI is updated in at least one BWP/CC out of BWPs/CCs included in the CC list, and the updated common TCI is a DL common TCI, the UE may apply the updated common TCI to a DL channel/RS of a specific type for all BWPs/CCs included in the CC list. The DL channel/RS of the specific type may be all DL channels/RSs, or may be multiple types of DL channels/RSs.
When a separate common TCI pool for the UL/DL is configured, a common TCI is updated in at least one BWP/CC out of BWPs/CCs included in the CC list, and the updated common TCI is a UL common TCI, the UE may apply the updated common TCI to a UL channel/RS of a specific type for all BWPs/CCs included in the CC list. The UL channel/RS of the specific type may be all UL channels/RSs, or may be multiple types of UL channels/RSs.
Operation in a case where a joint TCI pool for the UL and DL is configured/activated will be mentioned below, but this operation can also be similarly employed in a case where a separate TCI pool for the UL/DL is configured/activated.
The UE may follow any one of aspect 1-1 and aspect 1-2 below.
<<Aspect 1-1>>When a common TCI is indicated by DCI in one BWP/CC included in a CC list, common TCIs for all BWPs/CCs included in the CC list may be updated to the indicated common TCI.
The common TCI may be a QCL type A/D RS configured for a TCI state.
For each BWP/CC in the CC list, a plurality of common TCIs (common TCI pool) may be configured by RRC.
For each BWP/CC in the CC list, some (set of active common TCIs) of the plurality of configured common TCIs may be activated by a MAC CE.
A TCI field in DL DCI may indicate the common TCI. A new field (for example, a unified TCI field) in DL/UL DCI may indicate the common TCI.
In an example of
For one BWP/CC in the CC list, some (set of active common TCIs) of the plurality of configured common TCIs may be activated by the MAC CE. In this case, sets of active common TCIs for all BWPs/CCs in the CC list may be updated to the activated set of common TCIs.
In an example of
When a common TCI is indicated by a MAC CE in one BWP/CC included in a CC list, common TCIs for all BWPs/CCs included in the CC list may be updated to the indicated common TCI.
The common TCI may be a QCL type A/D RS configured for a TCI state.
For each BWP/CC in the CC list, a plurality of common TCIs (common TCI pool) may be configured by RRC. For one BWP/CC in the CC list, some (set of active common TCIs) of the plurality of configured common TCIs may be activated by the MAC CE.
If the MAC CE activates one common TCI out of the plurality of common TCIs, the UE may apply the activated common TCI to all BWPs/CCs in the CC list.
In an example of
In an example of
If the MAC CE in one BWP/CC in the CC list activates a plurality of common TCIs out of the plurality of common TCIs, the plurality of activated common TCIs (set of active common TCIs) may be applied to all BWPs/CCs in the CC list. In this case, the UE may follow at least one of aspect 1-2-1 and aspect 1-2-2 below.
[Aspect 1-2-1]When one common TCI out of a plurality of active common TCIs is indicated by DCI in one BWP/CC in the CC list, the indicated common TCI may be applied to all BWPs/CCs in the CC list.
Operation in this case may be similar to that of aspect 1-1 (
When one common TCI out of a plurality of active common TCIs is indicated by DCI in one BWP/CC in the CC list, the indicated common TCI may be applied to the BWP/CC. For each BWP/CC in the CC list, the DCI may indicate a common TCI for the BWP/CC.
In an example of
According to the first embodiment described above, overhead of TCI state notification for multiple types of channels/RSs in a plurality of BWPs/CCs can be suppressed.
Second EmbodimentA common TCI pool for each group (set, range) of a plurality of BWPs/a plurality of CCs may be configured by a higher layer. The common TCI pool may be configured for each band, or may be configured for each UE.
A common TCI in the common TCI pool may be indicated for the group of a plurality of BWPs/a plurality of CCs. The indicated common TCI may be referred to as a TCI state list. The TCI state list may indicate a TCI state for each BWP/CC.
The number of corresponding BWPs/CCs may vary depending on the TCI state list (group of a plurality of BWPs/a plurality of CCs). For example, when a broad beam is used, a common beam (TCI) can be applied to more CCs as compared to when a narrow beam is used.
A case that the numbers of corresponding BWPs/CCs are equal to each other between a plurality of TCI state lists (groups of a plurality of BWPs/a plurality of CCs) may be defined. In this case, UE operation is simple. The UE operation in this case may be similar to operation of the first embodiment, or may be similar to operation in Rel. 16.
The TCI state list may indicate an association between a BWP/CC and a TCI state. When the TCI state list is indicated by a MAC CE/DCI, a UE may apply a corresponding TCI state to (a common TCI for) each BWP/CC included in the TCI state list.
In an example of
A plurality of TCI state lists may be configured/activated by the RRC/MAC CE. One (one TCI state list ID) of the plurality of TCI state lists may be indicated by the DCI.
According to the second embodiment described above, overhead of TCI state notification for multiple types of channels/RSs in a plurality of BWPs/CCs can be suppressed.
Third EmbodimentWhen a UL TCI is indicated by using a common TCI, how to manage a transmit power control (TPC)-related parameter (power control parameter) is an issue. The TPC-related parameter may include at least one of a pathloss reference RS (PL-RS), P0, α, and a TPC command cumulative value of closed-loop TPC.
In Rel. 15, the TPC-related parameter for a PUCCH is notified in spatial relation information, and the TPC-related parameter for an SRS and PUSCH is notified separately from spatial relation information/SRS resource indicator (SRI).
The TPC-related parameter in a case where the common TCI is applied to UL may follow at least one of aspect 3-1 to aspect 3-4 below.
<<Aspect 3-1>>The TPC-related parameter in the case where the common TCI is applied to the UL may be configured separately from the common TCI.
In an example of
The TPC-related parameter may be notified by using a TPC-related parameter notification/configuration method in Rel. 15/16.
This TPC-related parameter notification method may be employed in the SRS/PUSCH.
For the PUCCH, a parameter including a spatial relation and a TPC-related parameter is notified. The PUCCH may follow any one of notification method 1 to notification method 3 below.
[Notification Method 1]Aspect 3-2 is employed in the PUCCH.
[Notification Method 2]For the PUCCH, the TPC-related parameter is notified by using the TPC-related parameter notification/configuration method (PUCCH spatial relation information, PUCCH-SpatialRelationInfo) in Rel. 15/16. When a case that the common TCI is applied to the PUCCH is defined in specifications/configured by RRC, the UE may not use the PUCCH spatial relation information, and may determine a spatial domain filter for the PUCCH (may obtain a spatial domain parameter/spatial domain setting) on the basis of the common TCI. In other words, the UE may ignore a spatial domain parameter/setting configured for the PUCCH spatial relation information.
[Notification Method 3]In the common TCI (as part of the common TCI), a PUCCH spatial relation information ID (PUCCH-SpatialRelationInfo-Id, association with the PUCCH spatial relation information, PUCCH spatial relation information associated with the common TCI) may be notified/configured.
An association between the common TCI and the TPC-related parameter may be notified/configured by a higher layer/DCI.
When a plurality of common TCIs (pool), a plurality of TPC-related parameters, and an association between a common TCI and a TPC-related parameter are notified/configured, and a common TCI is indicated/selected by RRC/MAC CE/DCI, the UE may apply a TPC-related parameter corresponding to the indicated/selected common TCI to UL transmission using the common TCI.
In an example of
At timing at which the common TCI is notified/indicated or at timing after that timing, the TPC-related parameter may be notified/indicated.
<<Aspect 3-2>>The TPC-related parameter in the case where the common TCI is applied to the UL may be configured in the common TCI.
In an example of
A field for configuring the TPC-related parameter may exist in common TCI configuration. When the common TCI has been indicated, the UE may apply a TPC-related parameter corresponding to the common TCI to UL transmission using the common TCI.
When the common TCI has been updated by RRC/MAC CE/DCI, the UE may apply a TPC-related parameter corresponding to the updated common TCI to UL transmission using the common TCI.
In an example of
A specific TPC-related parameter may not be configured. For example, the PL-RS may not be configured in the common TCI. When a common TCI in which the PL-RS is not configured has been indicated/notified, the UE may determine the PL-RS in accordance with a rule. For example, the rule may determine, as the PL-RS, a QCL type A RS or QCL type D RS with the notified common TCI. This QCL type A RS or QCL type D RS with the notified common TCI may be limited to an RS in an identical CC, or may include RSs in different CCs.
<<Aspect 3-3>>The first embodiment and a third embodiment may be combined with each other.
When a common TCI has been indicated by a MAC CE/DCI in one BWP/CC in a CC list, TPC-related parameters for all BWPs/CCs in the CC list may be updated to a TPC-related parameter corresponding to the common TCI.
A combination (pair, list) of a plurality of BWPs/a plurality of CCs may be notified/configured by the higher layer. A parameter (CC list) for notifying the combination of the plurality of BWPs/the plurality of CCs may be a simultaneous spatial updated list in Rel. 16 (simultaneousSpatial-UpdatedList-r16/simultaneousSpatial-UpdatedListSecond-r16), or may be a new parameter.
The CC list may be a list of CCs. Common TCI (TPC-related parameter) indication may be applied to all CCs/BWPs included in the CC list. The CC list may be configured by RRC, and which one or more CCs out of a plurality of CCs included in the CC list the common TCI (TPC-related parameter) indication is applied to may be indicated/selected by a MAC CE. In other words, the CC list may be notified by the RRC and the MAC CE.
When a joint common TCI pool for UL and DL is configured, and a common TCI is updated in at least one BWP/CC out of BWPs/CCs included in the CC list, the UE may apply, to all BWPs/CCs included in the CC list, a TPC-related parameter corresponding to the updated common TCI.
When a separate common TCI pool for the UL/DL is configured, a common TCI is updated in at least one BWP/CC out of BWPs/CCs included in the CC list, and the updated common TCI is a UL common TCI, the UE may apply, to a UL channel/RS of a specific type for all BWPs/CCs included in the CC list, a TPC-related parameter corresponding to the updated common TCI. The UL channel/RS of the specific type may be all UL channels/RSs, or may be multiple types of UL channels/RSs.
<<Aspect 3-4>>The second embodiment and the third embodiment may be combined with each other.
Each TCI state (common TCI) in the TCI state list in the second embodiment may be associated with a TPC-related parameter in a manner similar to that of aspect 3-1.
Each TCI state (common TCI) in the TCI state list in the second embodiment may include (hold, indicate, contain) a TPC-related parameter in a manner similar to that of aspect 3-2.
According to the third embodiment described above, when a common TCI is applied to UL transmission, an appropriate TPC-related parameter can be applied to the UL transmission.
Fourth EmbodimentWhen a common TCI has been updated, beam assumption and a TPC-related parameter for a UL/DL channel/RS may be updated.
Timing of application of the common TCI and timing of application of the TPC-related parameter may be equal to each other. In this case, a UL beam and a PL-RS can be equalized, and thus a UE can determine appropriate transmit power.
The timing of application of the common TCI and the timing of application of the TPC-related parameter may be different from each other. There is a case where measurement of a plurality of samples is necessary for pathloss calculation and the like, and thus the timing of application of the TPC-related parameter may be later than the timing of application of the common TCI. In this case, the UL beam is updated earlier than update of the PL-RS, thereby allowing UL beam control to be earlier, and an appropriate UL beam can be used.
Timing of application of a common TCI for a DL channel/RS and timing of application of a common TCI for a UL channel/RS may be different from each other. For a DL beam, there is no need to consider UL transmit power control, and thus the DL beam may be updated earlier than the UL beam. In this case, DL beam control can be earlier than control of the UL beam/TPC-related parameter.
The timing of application of the common TCI for the DL channel/RS and the timing of application of the common TCI for the UL channel/RS may be equal to each other. In this case, it is only necessary that the UE forms only one beam simultaneously for transmission and reception, and thus UE processing load can be suppressed.
When a joint common TCI pool for the UL and DL is configured, and a common TCI in the joint common TCI pool is updated/indicated/notified at time t_0, timing of application of a DL common TCI/UL common TCI/TPC-related parameter may follow at least one of timing 1-1 to timing 1-3 below.
[Timing 1-1]Timing of application of the DL common TCI and timing of application of the UL common TCI are time t_1. In other words, the timing of application of the DL common TCI and the timing of application of the UL common TCI are equal to each other.
[Timing 1-2]Timing of application of the DL common TCI is time t_1, and timing of application of the UL common TCI is time t_2. Note, however, that t_1<t_2. In other words, the timing of application of the DL common TCI and the timing of application of the UL common TCI are different from each other.
[Timing 1-3]Timing of application of the TPC-related parameter may be equal to timing of application of the UL common TCI (for example, t_2). The timing of application of the TPC-related parameter may be different from the timing of application of the UL common TCI. For example, the timing of application of the TPC-related parameter may be later than the timing of application of the UL common TCI. The timing of application of the TPC-related parameter may be time t_3, and t_3 may be greater than t_2 (t_2<t_3).
When a separate common TCI pool for the UL/DL is configured, timing of application of a DL common TCI/UL common TCI/TPC-related parameter may follow at least one of timing 2-1 to timing 2-4 below.
[Timing 2-1]When the DL common TCI is updated/indicated/notified at time t_0, timing of update of the DL common TCI may be time t_1.
[Timing 2-2]When the UL common TCI is updated/indicated/notified at time t_0, timing of update of the UL common TCI may be time t_2.
[Timing 2-3] t_2 may be greater than t_1 (t 1<t_2).
[Timing 2-4]Timing of application of the TPC-related parameter may be equal to timing of application of the UL common TCI (for example, t_2). The timing of application of the TPC-related parameter may be different from the timing of application of the UL common TCI. For example, the timing of application of the TPC-related parameter may be later than the timing of application of the UL common TCI. The timing of application of the TPC-related parameter may be time t_3, and t_3 may be greater than t_2 (t 2<t_3).
According to the fourth embodiment described above, timing of application of a DL common TCI/UL common TCI/TPC-related parameter can be appropriately determined.
Fifth EmbodimentIn DCI, a specific field (DCI field) capable of controlling a common TCI may follow at least one of field 1 to field 4 below.
[Field 1]An existing TCI field in DL DCI may be used for a joint TCI pool for both UL and DL in order to indicate a common TCI for both the DL and UL.
[Field 2]In addition to field 1, a new field (for example, a unified TCI field) for common TCI indication in UL DCI may be used for the joint TCI pool for both the UL and DL in order to indicate a common TCI for both the DL and UL.
[Field 3]For a separate TCI pool for the UL/DL, an existing TCI field in the DL DCI may be used in order to indicate a DL TCI, or a new field (for example, a unified TCI field) for common TCI indication in the UL DCI may be used in order to indicate a UL TCI.
[Field 4]For the separate TCI pool for the UL/DL, a new field (for example, a first TCI (TCI #1) field) in the DL DCI may be used in order to indicate a DL TCI, or a new field (for example, a second TCI (TCI #2) field) in the DL DCI may be used in order to indicate a UL TCI.
When the UL DCI is used for control of the common TCI, operation, such as introducing HARQ-ACK for the UL DCI, and updating the common TCI after ACK for a PUSCH, is conceivable for enhancement of reliability. When field 1 or field 4 described above is used, such operation is unnecessary, and thus UE operation is simple.
When only one common TCI (a common TCI pool including only one common TCI) is configured/activated, a size (the number of bits) of the specific field may be 0.
The size (the number of bits) of the specific field (DCI field) may vary depending on the number of common TCIs (the number of common TCIs in a common TCI pool (set, group, list)) configured/activated by a higher layer (RRC/MAC CE).
When the joint TCI pool for the DL and UL has been configured, the size of the specific field may follow at least one of size determination method 1-1 and size determination method 1-2 below.
[Size Determination Method 1-1]A size of a TCI field in the DL DCI may vary depending on the number of common TCIs configured/activated by the higher layer.
[Size Determination Method 1-2]In addition to size determination method 1-1, a size of a new field (for example, a unified TCI field) for common TCI indication in the UL DCI may vary depending on the number of common TCIs configured/activated by the higher layer.
When the separate TCI pool for the DL/UL has been configured, the size of the specific field may follow at least one of size determination method 2-1 and size determination method 2-2 below.
[Size Determination Method 2-1]A size of a TCI field in the DL DCI may vary depending on the number of DL common TCIs (the number of common TCIs in a DL common TCI pool) configured/activated by the higher layer. A size of a new field (for example, a unified TCI field) for common TCI indication in the UL DCI may vary depending on the number of UL common TCIs (the number of common TCIs in a UL common TCI pool) configured/activated by the higher layer.
[Size Determination Method 2-2]A size of a new field (for example, a first TCI (TCI #1) field) for DL common TCI indication in the DL DCI may vary depending on the number of DL common TCIs (the number of common TCIs in a DL common TCI pool) configured/activated by the higher layer. A size of a new field (for example, a second TCI (TCI #2) field) for UL common TCI indication in the UL DCI may vary depending on the number of UL common TCIs (the number of common TCIs in a DL common TCI pool) configured/activated by the higher layer.
When the number of common TCIs configured/activated by the higher layer (RRC/MAC CE) is 1, the specific field size may be 0. When the number of common TCIs configured/activated by the higher layer (RRC/MAC CE) is 2, the specific field size may be 1. When the number of common TCIs configured/activated by the higher layer (RRC/MAC CE) is 3 to 4, the specific field size may be 2. When the number of common TCIs configured/activated by the higher layer (RRC/MAC CE) is 5 to 8, the specific field size may be 3. When the number of common TCIs configured/activated by the higher layer (RRC/MAC CE) is N, the specific field size may be ceil(log 2(N)).
The specific field size may be notified/configured by the higher layer (RRC/MAC CE). The specific field size may vary depending on the number of active common TCIs notified by the MAC CE. In this case, a bare minimum DCI size can be used depending on a state notified by the MAC CE, and thus DCI overhead can be suppressed.
The size (the number of bits) of the specific field (DCI field) may vary depending on the number of active common TCIs.
Timing of application of the specific field size may be timing after a lapse of specific time from an end of transmission of ACK for a downlink channel for common TCI activation/deactivation. The specific time may be fixed time defined in specifications, may be configured by the RRC, or may be reported by a UE as a UE capability. For example, the fixed time may be 3 ms. The timing of application of the specific field size may be the same as timing of application of the common TCI activation/deactivation, or may be different from the timing of application of the common TCI activation/deactivation.
Before the timing of application, the UE may perform blind detection (monitoring) of DCI having the specific field size depending on the number of active common TCIs before update. After the timing of application, the UE may perform blind detection (monitoring) of DCI having the specific field size depending on the number of active common TCIs after update.
In an example of
Before the timing of application, the number of active common TCIs is 1, and the specific field size is 0 bit. After the timing of application, the number of active common TCIs is 4, and the specific field size is 2 bits.
When a DCI size is variable, and there is a discrepancy in states (active common TCIs) between a base station and the UE, the UE fails to decode the DCI. Thus, the specific field size being variable may be limited to a specific DCI format. For example, the specific DCI format may be at least one of DCI format 1_2 and DCI format 0_2. Even when the UE fails to decode DCI format 1_2 or DCI format 0_2 due to the discrepancy in states between the base station and the UE, a common TCI (fixed-size specific field) is notified by another DCI format 1_2, DCI format 0_2, or the like, thereby allowing the discrepancy in states between the base station and the UE to be resolved.
According to the fifth embodiment described above, a discrepancy in recognition of a common TCI between a UE and a base station can be avoided.
Other EmbodimentsA UE capability corresponding to at least one function (characteristic, feature) in the first to fifth embodiments may be defined. When a UE has reported this UE capability, the UE may perform a corresponding function. When the UE has reported this UE capability, and a higher layer parameter corresponding to this function has been configured, the UE may perform a corresponding function. The higher layer parameter (RRC information element) corresponding to this function may be defined. When this higher layer parameter has been configured, the UE may perform a corresponding function.
The UE capability may indicate whether the UE supports this function.
(Radio Communication System)Hereinafter, a structure of a radio communication system according to one embodiment of the present disclosure will be described. In this radio communication system, the radio communication method according to each embodiment of the present disclosure described above may be used alone or may be used in combination for communication.
The radio communication system 1 may support dual connectivity (multi-RAT dual connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). The MR-DC may include dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, dual connectivity (NR-E-UTRA Dual Connectivity (NE-DC)) between NR and LTE, and so on.
In EN-DC, a base station (eNB) of LTE (E-UTRA) is a master node (MN), and a base station (gNB) of NR is a secondary node (SN). In NE-DC, a base station (gNB) of NR is an MN, and a base station (eNB) of LTE (E-UTRA) is an SN.
The radio communication system 1 may support dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both of an MN and an SN are base stations (gNB) of NR).
The radio communication system 1 may include a base station 11 that forms a macro cell C1 of a relatively wide coverage, and base stations 12 (12a to 12c) that form small cells C2, which are placed within the macro cell C1 and which are narrower than the macro cell C1. The user terminal 20 may be located in at least one cell. The arrangement, the number, and the like of each cell and user terminal 20 are by no means limited to the aspect shown in the diagram. Hereinafter, the base stations 11 and 12 will be collectively referred to as “base stations 10,” unless specified otherwise.
The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).
Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cells C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band which is higher than 24 GHz (above-24 GHz). Note that frequency bands, definitions and so on of FR1 and FR2 are by no means limited to these, and for example, FR1 may correspond to a frequency band which is higher than FR2.
The user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.
The plurality of base stations 10 may be connected by a wired connection (for example, optical fiber in compliance with the Common Public Radio Interface (CPRI), the X2 interface and so on) or a wireless connection (for example, an NR communication). For example, if an NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to a higher station may be referred to as an “Integrated Access Backhaul (IAB) donor,” and the base station 12 corresponding to a relay station (relay) may be referred to as an “IAB node.”
The base station 10 may be connected to a core network 30 through another base station 10 or directly. For example, the core network 30 may include at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and so on.
The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-A, 5G, and so on.
In the radio communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), and so on may be used.
The wireless access scheme may be referred to as a “waveform.” Note that, in the radio communication system 1, another wireless access scheme (for example, another single carrier transmission scheme, another multi-carrier transmission scheme) may be used for a wireless access scheme in the UL and the DL.
In the radio communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), which is used by each user terminal 20 on a shared basis, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and so on, may be used as downlink channels.
In the radio communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), which is used by each user terminal 20 on a shared basis, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)) and so on may be used as uplink channels.
User data, higher layer control information, System Information Blocks (SIBs) and so on are communicated on the PDSCH. User data, higher layer control information and so on may be communicated on the PUSCH. The Master Information Blocks (MIBs) may be communicated on the PBCH.
Lower layer control information may be communicated on the PDCCH. For example, the lower layer control information may include downlink control information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.
Note that DCI for scheduling the PDSCH may be referred to as “DL assignment,” “DL DCI,” and so on, and DCI for scheduling the PUSCH may be referred to as “UL grant,” “UL DCI,” and so on. Note that the PDSCH may be interpreted as “DL data”, and the PUSCH may be interpreted as “UL data”.
For detection of the PDCCH, a control resource set (CORESET) and a search space may be used. The CORESET corresponds to a resource to search DCI. The search space corresponds to a search area and a search method of PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space, based on search space configuration.
One search space may correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may be referred to as a “search space set.” Note that a “search space,” a “search space set,” a “search space configuration,” a “search space set configuration,” a “CORESET,” a “CORESET configuration” and so on of the present disclosure may be interchangeably interpreted.
Uplink control information (UCI) including at least one of channel state information (CSI), transmission confirmation information (for example, which may be also referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, and so on), and scheduling request (SR) may be communicated by means of the PUCCH. By means of the PRACH, random access preambles for establishing connections with cells may be communicated.
Note that the downlink, the uplink, and so on in the present disclosure may be expressed without a term of “link.” In addition, various channels may be expressed without adding “Physical” to the head.
In the radio communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), and so on may be communicated. In the radio communication system 1, a cell-specific reference signal (CRS), a channel state information-reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), and so on may be communicated as the DL-RS.
For example, the synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for a PBCH) may be referred to as an “SS/PBCH block,” an “SS Block (SSB),” and so on. Note that an SS, an SSB, and so on may be also referred to as a “reference signal.”
In the radio communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), and so on may be communicated as an uplink reference signal (UL-RS). Note that DMRS may be referred to as a “user terminal specific reference signal (UE-specific Reference Signal).”
(Base Station)Note that, the present example primarily shows functional blocks that pertain to characteristic parts of the present embodiment, and it is assumed that the base station 10 may include other functional blocks that are necessary for radio communication as well. Part of the processes of each section described below may be omitted.
The control section 110 controls the whole of the base station 10. The control section 110 can be constituted with a controller, a control circuit, or the like described based on general understanding of the technical field to which the present disclosure pertains.
The control section 110 may control generation of signals, scheduling (for example, resource allocation, mapping), and so on. The control section 110 may control transmission and reception, measurement and so on using the transmitting/receiving section 120, the transmitting/receiving antennas 130, and the communication path interface 140. The control section 110 may generate data, control information, a sequence and so on to transmit as a signal, and forward the generated items to the transmitting/receiving section 120. The control section 110 may perform call processing (setting up, releasing) for communication channels, manage the state of the base station 10, and manage the radio resources.
The transmitting/receiving section 120 may include a baseband section 121, a Radio Frequency (RF) section 122, and a measurement section 123. The baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212. The transmitting/receiving section 120 can be constituted with a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, or the like described based on general understanding of the technical field to which the present disclosure pertains.
The transmitting/receiving section 120 may be structured as a transmitting/receiving section in one entity, or may be constituted with a transmitting section and a receiving section. The transmitting section may be constituted with the transmission processing section 1211, and the RF section 122. The receiving section may be constituted with the reception processing section 1212, the RF section 122, and the measurement section 123.
The transmitting/receiving antennas 130 can be constituted with antennas, for example, an array antenna, or the like described based on general understanding of the technical field to which the present disclosure pertains.
The transmitting/receiving section 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and so on. The transmitting/receiving section 120 may receive the above-described uplink channel, uplink reference signal, and so on.
The transmitting/receiving section 120 may form at least one of a transmit beam and a receive beam by using digital beam forming (for example, precoding), analog beam forming (for example, phase rotation), and so on.
The transmitting/receiving section 120 (transmission processing section 1211) may perform the processing of the Packet Data Convergence Protocol (PDCP) layer, the processing of the Radio Link Control (RLC) layer (for example, RLC retransmission control), the processing of the Medium Access Control (MAC) layer (for example, HARQ retransmission control), and so on, for example, on data and control information and so on acquired from the control section 110, and may generate bit string to transmit.
The transmitting/receiving section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (as necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-to-analog conversion, and so on, on the bit string to transmit, and output a baseband signal.
The transmitting/receiving section 120 (RF section 122) may perform modulation to a radio frequency band, filtering, amplification, and so on, on the baseband signal, and transmit the signal of the radio frequency band through the transmitting/receiving antennas 130.
On the other hand, the transmitting/receiving section 120 (RF section 122) may perform amplification, filtering, demodulation to a baseband signal, and so on, on the signal of the radio frequency band received by the transmitting/receiving antennas 130.
The transmitting/receiving section 120 (reception processing section 1212) may apply reception processing such as analog-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as necessary), filtering, de-mapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, the processing of the RLC layer and the processing of the PDCP layer, and so on, on the acquired baseband signal, and acquire user data, and so on.
The transmitting/receiving section 120 (measurement section 123) may perform the measurement related to the received signal. For example, the measurement section 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, and so on, based on the received signal. The measurement section 123 may measure a received power (for example, Reference Signal Received Power (RSRP)), a received quality (for example, Reference Signal Received Quality (RSRQ), a Signal to Interference plus Noise Ratio (SINR), a Signal to Noise Ratio (SNR)), a signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and so on. The measurement results may be output to the control section 110.
The communication path interface 140 may perform transmission/reception (backhaul signaling) of a signal with an apparatus included in the core network 30 or other base stations 10, and so on, and acquire or transmit user data (user plane data), control plane data, and so on for the user terminal 20.
Note that the transmitting section and the receiving section of the base station 10 in the present disclosure may be constituted with at least one of the transmitting/receiving section 120, the transmitting/receiving antennas 130, and the communication path interface 140.
The transmitting/receiving section 120 may transmit a TCI list indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, may transmit an update list indicating a plurality of serving cells, and may transmit indication information to indicate one or more TCI states out of the plurality of TCI states in one of the plurality of serving cells. The control section 110 may apply the one or more TCI states to the multiple types of channels in the plurality of serving cells.
The transmitting/receiving section 120 may transmit configuration information indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, and may transmit indication information indicating one TCI state out of the plurality of TCI states. The control section 110 may apply the one TCI state to the multiple types of channels, and may control reception of an uplink channel out of the multiple types of channels to which one power control parameter corresponding to the one TCI state out of a plurality of power control parameters is applied, the plurality of power control parameters being associated with the plurality of respective TCI states.
(User Terminal)Note that, the present example primarily shows functional blocks that pertain to characteristic parts of the present embodiment, and it is assumed that the user terminal 20 may include other functional blocks that are necessary for radio communication as well. Part of the processes of each section described below may be omitted.
The control section 210 controls the whole of the user terminal 20. The control section 210 can be constituted with a controller, a control circuit, or the like described based on general understanding of the technical field to which the present disclosure pertains.
The control section 210 may control generation of signals, mapping, and so on. The control section 210 may control transmission/reception, measurement and so on using the transmitting/receiving section 220, and the transmitting/receiving antennas 230. The control section 210 generates data, control information, a sequence and so on to transmit as a signal, and may forward the generated items to the transmitting/receiving section 220.
The transmitting/receiving section 220 may include a baseband section 221, an RF section 222, and a measurement section 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmitting/receiving section 220 can be constituted with a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, or the like described based on general understanding of the technical field to which the present disclosure pertains.
The transmitting/receiving section 220 may be structured as a transmitting/receiving section in one entity, or may be constituted with a transmitting section and a receiving section. The transmitting section may be constituted with the transmission processing section 2211, and the RF section 222. The receiving section may be constituted with the reception processing section 2212, the RF section 222, and the measurement section 223.
The transmitting/receiving antennas 230 can be constituted with antennas, for example, an array antenna, or the like described based on general understanding of the technical field to which the present disclosure pertains.
The transmitting/receiving section 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and so on. The transmitting/receiving section 220 may transmit the above-described uplink channel, uplink reference signal, and so on.
The transmitting/receiving section 220 may form at least one of a transmit beam and a receive beam by using digital beam forming (for example, precoding), analog beam forming (for example, phase rotation), and so on.
The transmitting/receiving section 220 (transmission processing section 2211) may perform the processing of the PDCP layer, the processing of the RLC layer (for example, RLC retransmission control), the processing of the MAC layer (for example, HARQ retransmission control), and so on, for example, on data and control information and so on acquired from the control section 210, and may generate bit string to transmit.
The transmitting/receiving section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (as necessary), IFFT processing, precoding, digital-to-analog conversion, and so on, on the bit string to transmit, and output a baseband signal.
Note that, whether to apply DFT processing or not may be based on the configuration of the transform precoding. The transmitting/receiving section 220 (transmission processing section 2211) may perform, for a certain channel (for example, PUSCH), the DFT processing as the above-described transmission processing to transmit the channel by using a DFT-s-OFDM waveform if transform precoding is enabled, and otherwise, does not need to perform the DFT processing as the above-described transmission process.
The transmitting/receiving section 220 (RF section 222) may perform modulation to a radio frequency band, filtering, amplification, and so on, on the baseband signal, and transmit the signal of the radio frequency band through the transmitting/receiving antennas 230.
On the other hand, the transmitting/receiving section 220 (RF section 222) may perform amplification, filtering, demodulation to a baseband signal, and so on, on the signal of the radio frequency band received by the transmitting/receiving antennas 230.
The transmitting/receiving section 220 (reception processing section 2212) may apply a receiving process such as analog-digital conversion, FFT processing, IDFT processing (as necessary), filtering, de-mapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, the processing of the RLC layer and the processing of the PDCP layer, and so on, on the acquired baseband signal, and acquire user data, and so on.
The transmitting/receiving section 220 (measurement section 223) may perform the measurement related to the received signal. For example, the measurement section 223 may perform RRM measurement, CSI measurement, and so on, based on the received signal. The measurement section 223 may measure a received power (for example, RSRP), a received quality (for example, RSRQ, SINR, SNR), a signal strength (for example, RSSI), channel information (for example, CSI), and so on. The measurement results may be output to the control section 210.
Note that the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be constituted with at least one of the transmitting/receiving section 220 and the transmitting/receiving antennas 230.
The transmitting/receiving section 220 may receive a TCI list (for example, a common TCI pool) indicating a plurality of transmission configuration indication (TCI) states (for example, common TCIs) applicable to multiple types of channels, may receive an update list (for example, a CC list) indicating a plurality of serving cells (for example, CCs), and may receive indication information (for example, DCI/MAC CE) to indicate one or more TCI states out of the plurality of TCI states in one of the plurality of serving cells. The control section 210 may apply the one or more TCI states to the multiple types of channels in the plurality of serving cells.
The indication information may be downlink control information. The downlink control information may indicate one TCI state (aspect 1-1).
The indication information may be a medium access control (MAC) control element (CE). The MAC CE may indicate the one or more TCI states (aspect 1-2).
The indication information may be downlink control information. The downlink control information may indicate one TCI state for each of the plurality of serving cells (the second embodiment).
The transmitting/receiving section 220 may receive configuration information (for example, a common TCI pool) indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, and may receive indication information (for example, DCI/MAC CE) indicating one TCI state out of the plurality of TCI states. The control section 210 may apply the one TCI state to the multiple types of channels, and may apply, to an uplink channel out of the multiple types of channels, one power control parameter corresponding to the one TCI state out of a plurality of power control parameters (for example, TPC-related parameters), the plurality of power control parameters being associated with the plurality of respective TCI states.
The transmitting/receiving section 220 may receive an update list indicating a plurality of serving cells, and may receive the indication information in one of the plurality of serving cells. The control section 210 may apply the one TCI state to the multiple types of channels in the plurality of serving cells, and may apply the one power control parameter to the uplink channel in the plurality of serving cells (the third embodiment).
The control section 210 may apply the one power control parameter to the uplink channel at timing at which the one TCI state is applied to the multiple types of channels or after the timing (the fourth embodiment).
The indication information may be a field in downlink control information. A size of the field may depend on the number of the plurality of TCI states (the fifth embodiment).
(Hardware Structure)Note that the block diagrams that have been used to describe the above embodiments show blocks in functional units. These functional blocks (components) may be implemented in arbitrary combinations of at least one of hardware and software. Also, the method for implementing each functional block is not particularly limited. That is, each functional block may be realized by one piece of apparatus that is physically or logically coupled, or may be realized by directly or indirectly connecting two or more physically or logically separate pieces of apparatus (for example, via wire, wireless, or the like) and using these plurality of pieces of apparatus. The functional blocks may be implemented by combining softwares into the apparatus described above or the plurality of apparatuses described above.
Here, functions include judgment, determination, decision, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, designation, establishment, comparison, assumption, expectation, considering, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, and the like, but function are by no means limited to these. For example, functional block (components) to implement a function of transmission may be referred to as a “transmitting section (transmitting unit),” a “transmitter,” and the like. The method for implementing each component is not particularly limited as described above.
For example, a base station, a user terminal, and so on according to one embodiment of the present disclosure may function as a computer that executes the processes of the radio communication method of the present disclosure.
Note that in the present disclosure, the words such as an apparatus, a circuit, a device, a section, a unit, and so on can be interchangeably interpreted. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of apparatuses shown in the drawings, or may be configured not to include part of apparatuses.
For example, although only one processor 1001 is shown, a plurality of processors may be provided. Furthermore, processes may be implemented with one processor or may be implemented at the same time, in sequence, or in different manners with two or more processors. Note that the processor 1001 may be implemented with one or more chips.
Each function of the base station 10 and the user terminals 20 is implemented, for example, by allowing certain software (programs) to be read on hardware such as the processor 1001 and the memory 1002, and by allowing the processor 1001 to perform calculations to control communication via the communication apparatus 1004 and control at least one of reading and writing of data in the memory 1002 and the storage 1003.
The processor 1001 controls the whole computer by, for example, running an operating system. The processor 1001 may be configured with a central processing unit (CPU), which includes interfaces with peripheral apparatus, control apparatus, computing apparatus, a register, and so on. For example, at least part of the above-described control section 110 (210), the transmitting/receiving section 120 (220), and so on may be implemented by the processor 1001.
Furthermore, the processor 1001 reads programs (program codes), software modules, data, and so on from at least one of the storage 1003 and the communication apparatus 1004, into the memory 1002, and executes various processes according to these. As for the programs, programs to allow computers to execute at least part of the operations of the above-described embodiments are used. For example, the control section 110 (210) may be implemented by control programs that are stored in the memory 1002 and that operate on the processor 1001, and other functional blocks may be implemented likewise.
The memory 1002 is a computer-readable recording medium, and may be constituted with, for example, at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other appropriate storage media. The memory 1002 may be referred to as a “register,” a “cache,” a “main memory (primary storage apparatus)” and so on. The memory 1002 can store executable programs (program codes), software modules, and the like for implementing the radio communication method according to one embodiment of the present disclosure.
The storage 1003 is a computer-readable recording medium, and may be constituted with, for example, at least one of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disc (Compact Disc ROM (CD-ROM) and so on), a digital versatile disc, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (for example, a card, a stick, and a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may be referred to as “secondary storage apparatus.”
The communication apparatus 1004 is hardware (transmitting/receiving device) for allowing inter-computer communication via at least one of wired and wireless networks, and may be referred to as, for example, a “network device,” a “network controller,” a “network card,” a “communication module,” and so on. The communication apparatus 1004 may be configured to include a high frequency switch, a duplexer, a filter, a frequency synthesizer, and so on in order to realize, for example, at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-described transmitting/receiving section 120 (220), the transmitting/receiving antennas 130 (230), and so on may be implemented by the communication apparatus 1004. In the transmitting/receiving section 120 (220), the transmitting section 120a (220a) and the receiving section 120b (220b) can be implemented while being separated physically or logically.
The input apparatus 1005 is an input device that receives input from the outside (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and so on). The output apparatus 1006 is an output device that allows sending output to the outside (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, and so on). Note that the input apparatus 1005 and the output apparatus 1006 may be provided in an integrated structure (for example, a touch panel).
Furthermore, these types of apparatus, including the processor 1001, the memory 1002, and others, are connected by a bus 1007 for communicating information. The bus 1007 may be formed with a single bus, or may be formed with buses that vary between pieces of apparatus.
Also, the base station 10 and the user terminals 20 may be structured to include hardware such as a microprocessor, a digital signal processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and so on, and part or all of the functional blocks may be implemented by the hardware. For example, the processor 1001 may be implemented with at least one of these pieces of hardware.
(Variations)Note that the terminology described in the present disclosure and the terminology that is needed to understand the present disclosure may be replaced by other terms that convey the same or similar meanings. For example, a “channel,” a “symbol,” and a “signal” (or signaling) may be interchangeably interpreted. Also, “signals” may be “messages.” A reference signal may be abbreviated as an “RS,” and may be referred to as a “pilot,” a “pilot signal,” and so on, depending on which standard applies. Furthermore, a “component carrier (CC)” may be referred to as a “cell,” a “frequency carrier,” a “carrier frequency” and so on.
A radio frame may be constituted of one or a plurality of periods (frames) in the time domain. Each of one or a plurality of periods (frames) constituting a radio frame may be referred to as a “subframe.” Furthermore, a subframe may be constituted of one or a plurality of slots in the time domain. A subframe may be a fixed time length (for example, 1 ms) independent of numerology.
Here, numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. For example, numerology may indicate at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a particular filter processing performed by a transceiver in the frequency domain, a particular windowing processing performed by a transceiver in the time domain, and so on.
A slot may be constituted of one or a plurality of symbols in the time domain (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, and so on). Furthermore, a slot may be a time unit based on numerology.
A slot may include a plurality of mini-slots. Each mini-slot may be constituted of one or a plurality of symbols in the time domain. A mini-slot may be referred to as a “sub-slot.” A mini-slot may be constituted of symbols less than the number of slots. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be referred to as “PDSCH (PUSCH) mapping type A.” A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as “PDSCH (PUSCH) mapping type B.”
A radio frame, a subframe, a slot, a mini-slot, and a symbol all express time units in signal communication. A radio frame, a subframe, a slot, a mini-slot, and a symbol may each be called by other applicable terms. Note that time units such as a frame, a subframe, a slot, mini-slot, and a symbol in the present disclosure may be interchangeably interpreted.
For example, one subframe may be referred to as a “TTI,” a plurality of consecutive subframes may be referred to as a “TTI,” or one slot or one mini-slot may be referred to as a “TTI.” That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, may be a shorter period than 1 ms (for example, 1 to 13 symbols), or may be a longer period than 1 ms. Note that a unit expressing TTI may be referred to as a “slot,” a “mini-slot,” and so on instead of a “subframe.”
Here, a TTI refers to the minimum time unit of scheduling in radio communication, for example. For example, in LTE systems, a base station schedules the allocation of radio resources (such as a frequency bandwidth and transmit power that are available for each user terminal) for the user terminal in TTI units. Note that the definition of TTIs is not limited to this.
TTIs may be transmission time units for channel-encoded data packets (transport blocks), code blocks, or codewords, or may be the unit of processing in scheduling, link adaptation, and so on. Note that, when TTIs are given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, codewords, or the like are actually mapped may be shorter than the TTIs.
Note that, in the case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (that is, one or more slots or one or more mini-slots) may be the minimum time unit of scheduling. Furthermore, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
A TTI having a time length of 1 ms may be referred to as a “normal TTI” (TTI in 3GPP Rel. 8 to Rel. 12), a “long TTI,” a “normal subframe,” a “long subframe,” a “slot” and so on. A TTI that is shorter than a normal TTI may be referred to as a “shortened TTI,” a “short TTI,” a “partial or fractional TTI,” a “shortened subframe,” a “short subframe,” a “mini-slot,” a “sub-slot,” a “slot” and so on.
Note that a long TTI (for example, a normal TTI, a subframe, and so on) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (for example, a shortened TTI and so on) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or longer than 1 ms.
A resource block (RB) is the unit of resource allocation in the time domain and the frequency domain, and may include one or a plurality of consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, and, for example, may be 12. The number of subcarriers included in an RB may be determined based on numerology.
Also, an RB may include one or a plurality of symbols in the time domain, and may be one slot, one mini-slot, one subframe, or one TTI in length. One TTI, one subframe, and so on each may be constituted of one or a plurality of resource blocks.
Note that one or a plurality of RBs may be referred to as a “physical resource block (Physical RB (PRB)),” a “sub-carrier group (SCG),” a “resource element group (REG),” a “PRB pair,” an “RB pair” and so on.
Furthermore, a resource block may be constituted of one or a plurality of resource elements (REs). For example, one RE may correspond to a radio resource field of one subcarrier and one symbol.
A bandwidth part (BWP) (which may be referred to as a “fractional bandwidth,” and so on) may represent a subset of contiguous common resource blocks (common RBs) for certain numerology in a certain carrier. Here, a common RB may be specified by an index of the RB based on the common reference point of the carrier. A PRB may be defined by a certain BWP and may be numbered in the BWP.
The BWP may include a UL BWP (BWP for the UL) and a DL BWP (BWP for the DL). One or a plurality of BWPs may be configured in one carrier for a UE.
At least one of configured BWPs may be active, and a UE does not need to assume to transmit/receive a certain signal/channel outside active BWPs. Note that a “cell,” a “carrier,” and so on in the present disclosure may be interpreted as a “BWP”.
Note that the above-described structures of radio frames, subframes, slots, mini-slots, symbols, and so on are merely examples. For example, structures such as the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the numbers of symbols and RBs included in a slot or a mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and so on can be variously changed.
Also, the information, parameters, and so on described in the present disclosure may be represented in absolute values or in relative values with respect to certain values, or may be represented in another corresponding information. For example, radio resources may be specified by certain indices.
The names used for parameters and so on in the present disclosure are in no respect limiting. Furthermore, mathematical expressions that use these parameters, and so on may be different from those expressly disclosed in the present disclosure. For example, since various channels (PUCCH, PDCCH, and so on) and information elements can be identified by any suitable names, the various names allocated to these various channels and information elements are in no respect limiting.
The information, signals, and so on described in the present disclosure may be represented by using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and so on, all of which may be referenced throughout the herein-contained description, may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination of these.
Also, information, signals, and so on can be output in at least one of from higher layers to lower layers and from lower layers to higher layers. Information, signals, and so on may be input and/or output via a plurality of network nodes.
The information, signals, and so on that are input and/or output may be stored in a specific location (for example, a memory) or may be managed by using a management table. The information, signals, and so on to be input and/or output can be overwritten, updated, or appended. The information, signals, and so on that are output may be deleted. The information, signals, and so on that are input may be transmitted to another apparatus.
Reporting of information is by no means limited to the aspects/embodiments described in the present disclosure, and other methods may be used as well. For example, reporting of information in the present disclosure may be implemented by using physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI), higher layer signaling (for example, Radio Resource Control (RRC) signaling, broadcast information (master information block (MIB), system information blocks (SIBs), and so on), Medium Access Control (MAC) signaling and so on), and other signals or combinations of these.
Note that physical layer signaling may be referred to as “Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signals),” “L1 control information (L1 control signal),” and so on. Also, RRC signaling may be referred to as an “RRC message,” and can be, for example, an RRC connection setup message, an RRC connection reconfiguration message, and so on. Also, MAC signaling may be reported using, for example, MAC control elements (MAC CEs).
Also, reporting of certain information (for example, reporting of “X holds”) does not necessarily have to be reported explicitly, and can be reported implicitly (by, for example, not reporting this certain information or reporting another piece of information).
Determinations may be made in values represented by one bit (0 or 1), may be made in Boolean values that represent true or false, or may be made by comparing numerical values (for example, comparison against a certain value).
Software, whether referred to as “software,” “firmware,” “middleware,” “microcode,” or “hardware description language,” or called by other terms, should be interpreted broadly to mean instructions, instruction sets, code, code segments, program codes, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on.
Also, software, commands, information, and so on may be transmitted and received via communication media. For example, when software is transmitted from a website, a server, or other remote sources by using at least one of wired technologies (coaxial cables, optical fiber cables, twisted-pair cables, digital subscriber lines (DSL), and so on) and wireless technologies (infrared radiation, microwaves, and so on), at least one of these wired technologies and wireless technologies are also included in the definition of communication media.
The terms “system” and “network” used in the present disclosure can be used interchangeably. The “network” may mean an apparatus (for example, a base station) included in the network.
In the present disclosure, the terms such as “precoding,” a “precoder,” a “weight (precoding weight),” “quasi-co-location (QCL),” a “Transmission Configuration Indication state (TCI state),” a “spatial relation,” a “spatial domain filter,” a “transmit power,” “phase rotation,” an “antenna port,” an “antenna port group,” a “layer,” “the number of layers,” a “rank,” a “resource,” a “resource set,” a “resource group,” a “beam,” a “beam width,” a “beam angular degree,” an “antenna,” an “antenna element,” a “panel,” and so on can be used interchangeably.
In the present disclosure, the terms such as a “base station (BS),” a “radio base station,” a “fixed station,” a “NodeB,” an “eNB (eNodeB),” a “gNB (gNodeB),” an “access point,” a “transmission point (TP),” a “reception point (RP),” a “transmission/reception point (TRP),” a “panel,” a “cell,” a “sector,” a “cell group,” a “carrier,” a “component carrier,” and so on can be used interchangeably. The base station may be referred to as the terms such as a “macro cell,” a small cell,” a “femto cell,” a “pico cell,” and so on.
A base station can accommodate one or a plurality of (for example, three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area can provide communication services through base station subsystems (for example, indoor small base stations (Remote Radio Heads (RRHs))). The term “cell” or “sector” refers to part of or the entire coverage area of at least one of a base station and a base station subsystem that provides communication services within this coverage.
In the present disclosure, the terms “mobile station (MS),” “user terminal,” “user equipment (UE),” and “terminal” may be used interchangeably.
A mobile station may be referred to as a “subscriber station,” “mobile unit,” “subscriber unit,” “wireless unit,” “remote unit,” “mobile device,” “wireless device,” “wireless communication device,” “remote device,” “mobile subscriber station,” “access terminal,” “mobile terminal,” “wireless terminal,” “remote terminal,” “handset,” “user agent,” “mobile client,” “client,” or some other appropriate terms in some cases.
At least one of a base station and a mobile station may be referred to as a “transmitting apparatus,” a “receiving apparatus,” a “radio communication apparatus,” and so on. Note that at least one of a base station and a mobile station may be device mounted on a moving object or a moving object itself, and so on. The moving object may be a vehicle (for example, a car, an airplane, and the like), may be a moving object which moves unmanned (for example, a drone, an automatic operation car, and the like), or may be a robot (a manned type or unmanned type). Note that at least one of a base station and a mobile station also includes an apparatus which does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor, and the like.
Furthermore, the base station in the present disclosure may be interpreted as a user terminal. For example, each aspect/embodiment of the present disclosure may be applied to the structure that replaces a communication between a base station and a user terminal with a communication between a plurality of user terminals (for example, which may be referred to as “Device-to-Device (D2D),” “Vehicle-to-Everything (V2X),” and the like). In this case, user terminals 20 may have the functions of the base stations 10 described above. The words “uplink” and “downlink” may be interpreted as the words corresponding to the terminal-to-terminal communication (for example, “side”). For example, an uplink channel, a downlink channel and so on may be interpreted as a side channel.
Likewise, the user terminal in the present disclosure may be interpreted as base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.
Actions which have been described in the present disclosure to be performed by a base station may, in some cases, be performed by upper nodes. In a network including one or a plurality of network nodes with base stations, it is clear that various operations that are performed to communicate with terminals can be performed by base stations, one or more network nodes (for example, Mobility Management Entities (MMEs), Serving-Gateways (S-GWs), and so on may be possible, but these are not limiting) other than base stations, or combinations of these.
The aspects/embodiments illustrated in the present disclosure may be used individually or in combinations, which may be switched depending on the mode of implementation. The order of processes, sequences, flowcharts, and so on that have been used to describe the aspects/embodiments in the present disclosure may be re-ordered as long as inconsistencies do not arise. For example, although various methods have been illustrated in the present disclosure with various components of steps in exemplary orders, the specific orders that are illustrated herein are by no means limiting.
The aspects/embodiments illustrated in the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (where x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems that use other adequate radio communication methods and next-generation systems that are enhanced based on these. A plurality of systems may be combined (for example, a combination of LTE or LTE-A and 5G, and the like) and applied.
The phrase “based on” (or “on the basis of”) as used in the present disclosure does not mean “based only on” (or “only on the basis of”), unless otherwise specified. In other words, the phrase “based on” (or “on the basis of”) means both “based only on” and “based at least on” (“only on the basis of” and “at least on the basis of”).
Reference to elements with designations such as “first,” “second,” and so on as used in the present disclosure does not generally limit the quantity or order of these elements. These designations may be used in the present disclosure only for convenience, as a method for distinguishing between two or more elements. Thus, reference to the first and second elements does not imply that only two elements may be employed, or that the first element must precede the second element in some way.
The term “judging (determining)” as in the present disclosure herein may encompass a wide variety of actions. For example, “judging (determining)” may be interpreted to mean making “judgments (determinations)” about judging, calculating, computing, processing, deriving, investigating, looking up, search and inquiry (for example, searching a table, a database, or some other data structures), ascertaining, and so on.
Furthermore, “judging (determining)” may be interpreted to mean making “judgments (determinations)” about receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), and so on.
In addition, “judging (determining)” as used herein may be interpreted to mean making “judgments (determinations)” about resolving, selecting, choosing, establishing, comparing, and so on. In other words, “judging (determining)” may be interpreted to mean making “judgments (determinations)” about some action.
In addition, “judging (determining)” may be interpreted as “assuming,” “expecting,” “considering,” and the like.
“The maximum transmit power” according to the present disclosure may mean a maximum value of the transmit power, may mean the nominal maximum transmit power (the nominal UE maximum transmit power), or may mean the rated maximum transmit power (the rated UE maximum transmit power).
The terms “connected” and “coupled,” or any variation of these terms as used in the present disclosure mean all direct or indirect connections or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be interpreted as “access.”
In the present disclosure, when two elements are connected, the two elements may be considered “connected” or “coupled” to each other by using one or more electrical wires, cables and printed electrical connections, and, as some non-limiting and non-inclusive examples, by using electromagnetic energy having wavelengths in radio frequency regions, microwave regions, (both visible and invisible) optical regions, or the like.
In the present disclosure, the phrase “A and B are different” may mean that “A and B are different from each other.” Note that the phrase may mean that “A and B is each different from C.” The terms “separate,” “be coupled,” and so on may be interpreted similarly to “different.”
When terms such as “include,” “including,” and variations of these are used in the present disclosure, these terms are intended to be inclusive, in a manner similar to the way the term “comprising” is used. Furthermore, the term “or” as used in the present disclosure is intended to be not an exclusive disjunction.
For example, in the present disclosure, when an article such as “a,” “an,” and “the” in the English language is added by translation, the present disclosure may include that a noun after these articles is in a plural form.
Now, although the invention according to the present disclosure has been described in detail above, it should be obvious to a person skilled in the art that the invention according to the present disclosure is by no means limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented with various corrections and in various modifications, without departing from the spirit and scope of the invention defined by the recitations of claims. Consequently, the description of the present disclosure is provided only for the purpose of explaining examples, and should by no means be construed to limit the invention according to the present disclosure in any way.
Claims
1. A terminal comprising:
- a receiving section that receives a TCI list indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, that receives an update list indicating a plurality of serving cells, and that receives indication information to indicate one or more TCI states out of the plurality of TCI states in one of the plurality of serving cells; and
- a control section that applies the one or more TCI states to the multiple types of channels in the plurality of serving cells.
2. The terminal according to claim 1, wherein
- the indication information is downlink control information, and
- the downlink control information indicates one TCI state.
3. The terminal according to claim 1, wherein
- the indication information is a medium access control (MAC) control element (CE), and
- the MAC CE indicates the one or more TCI states.
4. The terminal according to claim 1, wherein
- the indication information is downlink control information, and
- the downlink control information indicates one TCI state for each of the plurality of serving cells.
5. A radio communication method for a terminal, the radio communication method comprising:
- receiving a TCI list indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, receiving an update list indicating a plurality of serving cells, and receiving indication information to indicate one or more TCI states out of the plurality of TCI states in one of the plurality of serving cells; and
- applying the one or more TCI states to the multiple types of channels in the plurality of serving cells.
6. A base station comprising:
- a transmitting section that transmits a TCI list indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, that transmits an update list indicating a plurality of serving cells, and that transmits indication information to indicate one or more TCI states out of the plurality of TCI states in one of the plurality of serving cells; and
- a control section that applies the one or more TCI states to the multiple types of channels in the plurality of serving cells.
Type: Application
Filed: Oct 16, 2020
Publication Date: Nov 23, 2023
Applicant: NTT DOCOMO, INC. (Tokyo)
Inventors: Yuki Matsumura (Tokyo), Satoshi Nagata (Tokyo)
Application Number: 18/029,999
